<div>
  This monitors the available virtual memory (also known as
  <code>swap space</code>
  ).
  <p>The exact definition of swap space is platform dependent.</p>
  <ul>
    <li>
      On Windows this is the available space of the page file. As Windows can
      automatically increase the page file size, this value doesn't mean much.
    </li>
    <li>
      On Linux this value is retrieved from
      <code>/proc/meminfo</code>
      .
    </li>
    <li>
      For other Unix systems, the value is obtained from the
      <code>top</code>
      command.
    </li>
  </ul>
</div>
